Yes, the change in bolt pattern was between '84 and '85 model years. It went from the 4 1/2" pattern to the 5 1/2". The earlier 4 X 4's had the big pattern also.I used to have an 85' Ram 150 2WD. I do know that in 85 they went to a larger bolt pattern and remember the wheels off of my Uncle's 84' would not fit. I don't remember what the bolt pattern measured but I bet they went from 4 inch to 4 1/2 " in 85.
Yes, the change in bolt pattern was between '84 and '85 model years. It went from the 4 1/2" pattern to the 5 1/2". The earlier 4 X 4's had the big pattern also.